Sound-box.



W. F. GRUPE.

SOUND BOX.

APPLICATION FILED APR-2|. l9I5.

1,162,351. Patented Nov. 30, 1915..

aw wm T 1541. 1* fiw v UHE s as WILLIAM F. GRUPE, OF JERSEY CITY, NEW JERSEY.

SOUND-BOX.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed April 21, 1915. Serial No. 22,749.

To all whom it may concern:

Be it known that 1, WILLIAM F. Qanrn, a citizen of the United States, and residlng at Jersey City, county of Hudson, State of New Jersey, have invented certain new and useful Improvements 1n Sound-Boxes, of

which the followingis a specification.

cure the desired rigidity and improved resiliency of the stylus lever and'suspension means by novel means which can be constructed and assembled by workmen of 11mited ability and at a materially reduced cost.

Another object of this invention is to in sure substantial uniformity in the performance of sound boxes especially when manufactured in large quantities in accordance with this invention. This and other objects are attained by the provision of one or more recesses of predetermined depths within the casing of the sound box, flexible pins or other suitable members of certain lengths extending from the stylus leverinto said recesses and a clamping plate for retaining such pins or other members within said recesses to the desired depth thereof. Preferably, such recess or recesses are open along longitudinal sides thereof and a stop plate is provided to limit the extent of depth of such pin or pins, or other members, within said recesses and also to brace the clamping plate.

Further features and objects of my invention will be more fully understood from the following description and the accompanying drawings, in which- Figure 1 is a front side elevation of an embodiment of my invention; Fig.2 is an end elevation of Fig. l; and Fig. 3 is a detail front elevation of the abutment portion of the sound box casing.

. Referring to the drawings, the casing l of the sound box is of any approved construction and suitably supports the diaphragm 2 therein. The tone arm 3 is connected to the back of the sound box 1 by any approved connection.

The particular embodiment shown in the drawings comprises a downwardly extending portion 4, serving as an abutment, and provided with two recesses 5, 6, illustrated as semicircular in formation and extending predetermined distances toward the rear of the casing 1. Such recesses 5, 6 are constructed to respectively receive the pins 7, 8, shown as substantially circular in cross section, extending from or carried by the stylus lever 9. The stylus lever 9 is preferably constructed to have an upper reduced end portion 10 at which it is secured to the diaphragm 2, an enlarged and greatly widened portion 11, and a lower somewhat narrower relatively heavy endportion 12, provided with an opening to receive a stylus or needle and a set screw 13 for securing the same therein. The pins 7, 8 are preferably disposed in a plane substantially at right angles to the direction of length to the stylus lever and at substantially equal distances relatively to the plane passing through the center of the stylus lever in the direction of length of the same. The pins 7, 8 may be integral with the enlarged portion 11 or may be brazed within openings within said enlarged portion 11. of preferably highly resilient material, such as tempered steel, tempered steel alloys, etc. The pins 7, 8 are secured within their respective openings 5, 6 by means of the clamping plate 14.- and one or more screws 15. Preferably, the rearwardly disposed stop plate is provided to limit the position of the rear ends of the pins 7, 8. Such stop plate 16 also serves to brace the clamping plate 14.

The parts of the sound box are assembled by placing the pins 7, 8 within the respective recesses 5, 6, then tightening the ciamping plate 14 by means of the'one or more screws 15 and finally securing the connection 'of the reduced end portion 10 with the diaphragm 2, the last named connection being performed in any approved manner. Normally, in the preferred forms of my construction, the pins 7, 8 extend in directions substantially at right angles to the plane of rest of the diaphragm 2. It is desirable to construct the enlarged portion 11 to normally extend to the rear of the front face ofthe casing and-to closely approach the front face of the downwardly extending portion 4c of the casing 1. 7

It will be noted, in the embodiment ilvis- The pins 7, 8 are made trated in the drawings, that the clamping plate ll. engages the portions of the substantially circular pins 7, 8, which project through the open longitudinal sides of the substantially semi-circular recesses 5, 6,

whereby the end 10 of the stylus lever 9 is.

readily adjusted relatively to the diaphragm 2.

It will be noted that the improved abutment set forth herein is also applicable for tionthe remaining pins or their equivalents symmetrically .with respect to the longitudinal principal axis of the stylus lever.

VVhere-as I have illustrated and described my invention by reference to specific forms thereof, it will be understood that many changes and modifications may be made Without departing from my invention.

What I claim and desire to secure by Letters Patent is:

1. The combination Witha sound box provided with a substantially semi-circular recess of predetermined depth and open along a longitudinal side, of astylus lever, a substantially circular flexible member extending from said stylus lever into saidrecess and projecting through said open longitudinal side and means engaging said adapted to engage said projecting portions of the flexible. members and threaded members for holding said clamping plate to said abutment.

3. The combination of a sound box having an abutment provided with a plurality of substantially semi-circular recesses of predetermined depths, said recesses .being open on the same sides, a stylus lever, a plurality of substantially circular flexible members extending from said stylus lever into saidi'ecesses and projecting through said open sides, means positively limiting the extent of insertion of said members Within said recesses and means adapted to engage said flexible members along the portions 1 thereof projecting through said open sides and also adapted to engage said limiting means.

In testimony whereof I have signed this specification in the presence of tWo subscribing witnesses.

, WILIZIAM F. GRUPE.

I Witnesses: K. G. LEARD,

S. M. BAEDER.

Copies of this patent may be obtained for live cents each, by addressing} the Commissioner of Patents.

, Washington, D. O. 

